Multi-channel connector for brain stimulation system

ABSTRACT

An implantable connector used with a neurological device and a lead extension includes a male connector having a plurality of electrical contacts axially arranged along the connector, insulated from each other. The connector also includes a female connector having one or more channels axially disposed therein and a plurality of conductors axially arranged on the female connector. The plurality of conductors are electrically insulated from each other, and at least one indexing element is disposed adjacent one or more of the channels. The indexing element allows the male connector to be received into the one or more channels in a defined orientation relative to the channel, thereby forming at least two electrical connections along two or more axial positions. Often the neurological device is a brain stimulating and recording lead. The male and female connectors are often fastened together with a screw or by twist-locking the two members together.

CROSS-REFERENCES TO RELATED APPLICATIONS

The present application is a divisional of U.S. patent application Ser.No. 11/830,565, filed Jul. 30, 2007, now U.S. Pat. No. 7,583,999, whichclaims the benefit of U.S. Provisional Patent Application No. 60/820,914, filed Jul. 31, 2006, the full disclosures of which are incorporatedherein by reference.

BACKGROUND OF THE INVENTION

1. Field of the Invention

This invention relates generally to medical apparatus and methods, andmore specifically to a connector used to electrically couple a brainstimulating and recording probe or lead to a lead extension, pulsegenerator or other neurological device.

Implanting medical devices such as probes or leads within the cranium isan increasingly important approach for treatment of diseases such asParkinson's Disease, essential tremor and dystonia. Implants may be usedto treat a wide array of disorders, such as depression, epilepsy,dystonia, obsessive compulsive disorder, obesity, chronic pain as wellas in post-stroke rehabilitation. Most of these devices interact withthe brain by applying current through an electrode. In addition,infusion of drugs through a chronically implanted probe has beenproposed in the medical literature either as a primary treatment, or asan adjunctive treatment to electrical stimulation, in patients withAlzheimer's and Parkinson's Diseases, among others.

Current implantable probes are typically configured as small diametercylinders or tubes, with several circumferential metal stimulating ringsnear the distal tip, and an electrically passive central axial lumen.The metal stimulating rings are used to provide electrical stimulationto tissue such as the brain, while the central axial lumen can be usedto deliver the probe over a guidewire or stylet during the implantationprocedure. Helical wires course through the body of the probe andterminate on another set of metal connector rings which fit into aconnector integrated into a lead extension. The conductors are encasedin a flexible polymer to provide insulation.

Brain stimulating and recording probes are typically connected to a leadextension through a linear array of cylindrical screw terminals. Anelectrical connection is made when a screw is rotated so as to impingeupon one of the stiff metal connector rings, and force it against astranded wire which is continuous with conductors of the lead extension.The screw provides contact pressure, and under this pressure individualwire strands are slightly displaced against the surface of the stiffconnector ring, providing the elements of a secure electricalconnection. Flexible segments between the stiff connector rings providemechanical isolation, so that each contact may be formed independently.

Connectors are often cylindrical with a diameter that matches thestimulating probe body and are robust enough to accommodate physicalmanipulation. Additionally, usually, one screw must be tightened foreach electrical connection. The torque applied to the screw must becontrolled carefully since over-tightening can result in damage to thescrew terminal or probe, and under-tightening can result in a poorconnection.

Current probe or lead designs steer electrical current into tissue byshaping the electrical field through coordinated stimulation of multiplecontact sites, such as those disclosed in U.S. patent application Ser.No. 11/828,547 filed Jul. 26, 2007, the entire contents of which areincorporated herein by reference. Such probes may also record neuronalactivity near stimulation sites to evaluate the state of the brainand/or disease process to evaluate the local neuronal effects of shapedelectrical stimulation. Thus, more electrical contact sites are neededto integrate stimulating and recording functions, and construction of ahigh density multi-channel electrical connector is necessary to couplethe stimulating probe with a pulse generator and controller.

For these reasons as well as others, it would be desirable to providehigh density multi-channel electrical connectors for brain stimulationsystems that are sterilizable, implantable and easy to use in a surgicalenvironment. It would be particularly desirable to provide connectorswhich are the same diameter or smaller than the stimulating probe body.Providing small size, low profile connectors allow them to be easilyimplanted subcutaneously using existing surgical instruments such asguide tubes and tunnelers. It is also desirable to provide asymmetrically shaped connector so that the lead extension does not moveexcessively or apply excessive torque after implantation.

2. Description of Background Art

Prior patents and publications describing lead connectors include: U.S.Publication Nos. 2004/0039434 and U.S. Pat. Nos. 4,236,525; 4,437,474;4,603,696; 6,980,863; and 6,912,423.

BRIEF SUMMARY OF THE INVENTION

The invention generally provides a connector for electrically connectinga plurality of electrical conductors. The connector is optimized toconnect a neurological device such as a brain stimulating and recordinglead to a lead extension or a stimulation and/or controller unit. Theconnector is small and suitable for implantation into the body. Itsshape and configuration facilitates convenient handling by surgeons andother healthcare professionals in the operating room. Its size minimizesthe metal required to make electrical connections, which in turnimproves compatibility with imaging systems which depend on magneticfields, such as magnetic resonance imaging (MRI), spectroscopy, andmagneto encephalography (MEG).

In a first aspect of the present invention, a connector for coupling aneurological device with a lead extension comprises a male connectorhaving a plurality of electrical contacts axially arranged along theconnector and electrically insulated from each other. The connector alsoincludes a female connector having one or more channels axially disposedtherein and a plurality of conductors axially arranged thereon. Theplurality of conductors are electrically insulated from each other.Also, at least one indexing element is disposed adjacent to one or moreof the channels and the indexing element allows the male connector to bereceived into the one or more channels in a defined orientation relativeto the channel, thereby forming at least two electrical connectionsalong two or more axial positions.

In a second aspect of the present invention, a connector systemcomprises a connector comprising a male connector, a female connector,and one or more channels axially disposed in the female connector,wherein at least one of the channels has an indexing element adapted toreceive the male connector in a defined orientation relative to thefemale connector, thereby forming at least two electrical connectionsalong two or more axial positions. The system also includes aneurological device that is electrically coupled with at least one ofthe male and female connectors and a lead extension also electricallycoupled with at least one of the male and female connectors. Animplantable and controllable pulse generator is also included in thesystem. The pulse generator is adapted to provide an electrical stimulusto the neurological device via the male and female connectors. Thesystem may include a protective sheath that is adapted to cover the maleand female connectors as well as an anchoring device. The anchoringdevice is adapted to removably fix the neurological device to apatient's head. Sometimes the system may include a patient programmerthat is adapted to control the pulse generator.

In a third aspect of the present invention, a method for connecting aneurological device with a lead extension comprises positioning a maleconnector relative to a female connector having one or more channelsdisposed therein and inserting the male connector into one of thechannels thereby forming at least two electrical connections along twoor more axial positions. The male and female connectors are releasablyfastened together and then the coupled male and female connectors areimplanted into a patient. The step of fastening may comprise tighteninga screw and also the step may comprise rotating the male connectorrelative to the female connector thereby forming a secure electricalconnection therebetween.

The male connector may be electrically coupled with a neurologicaldevice such as a brain stimulating and recording lead. The femaleconnector may be electrically coupled with a lead extension or othermedical device. Sometimes the female connector and the lead extensionare fixedly coupled together or they may be integral with one another.Sometimes at least some of the conductors of the female connector areintegral with wires in the lead extension. Often, the male and femaleconnectors are compatible with magnetic resonance imaging. Also, whenthe male and female connectors are engaged together they may form ahermetic seal or be wrapped by a sheath which forms the seal. The sheathusually covers at least a portion of the male and female connectors.

Sometimes the male connector comprises two or more elongated members. Atleast one of these elongated members may be hemi-cylindrically shaped orthe male connector may have a cross-sectional shape selected from thegroup consisting of rectangular, triangular, elliptical, circular,square and ovoid. Often the female connector has a longitudinal axis andthe at least two electrical connections are symmetrical thereabout. Thefemale connector may slidably receive the male connector.

Sometimes the male connector may comprise a rod receivable by thechannel and wherein the plurality of electrical contacts are disposed ontabs radially extending outward from the rod, thus the male connectorrotationally engages the female connector. Two or more tabs may bedisposed circumferentially around the rod at two or more axialpositions, with each tab having at least two electrical contacts.Sometimes, the rod comprises a central cavity through which electricalconductors from the neurological device traverse at least partially andthe electrical conductors may terminate at electrical contacts disposedon the tabs. The tabs may be spaced apart by valleys through whichelectrical conductors from the neurological device traverse. Sometimesthe conductors comprise spring terminals and the spring terminals mayfollow a substantially helical path along a longitudinal axis of thefemale connector, forming a cardiod shape when viewed from an end of thefemale connector.

The connector may also comprise a fastener adapted to releasablycompress at least two of the conductors in the female connector againstat least two of the contacts in the male connector thereby forming atleast two secure electrical connections therebetween. Sometimes thefastener comprises a screw that is threadably engaged with the femaleconnector. Sometimes the connector may comprise a rotating camshaft or aplug slidably received by the female connector. The camshaft or plug isadapted to releasably compress at least two of the conductors in thefemale connector against at least two of the contacts in the maleconnector thereby forming at least two secure electrical connectionstherebetween.

The male connector may engage the female connector forming a body with aprofile that is substantially cylindrical such that when the body isrotated it has substantially the same profile in any position. The maleconnector may comprise a polymer selected from the group consisting ofpolyetheretherketone (PEEK), polyetherimide (Ultem™) and polyimide.Also, the indexing element may be integral with the female connector andit may be a pin. Sometimes the connector may have a central lumen thatis adapted to accommodate a guidewire, stylet or fluid. The femaleconnector may be of monolithic construction and it may comprise apolymer selected from the group consisting of polyetheretherketone,polyetherimide and polyimide. The female connector may also befabricated substantially from a metal such as stainless steel. Sometimesthe female connector comprises a dividing element separating two axialgroups of conductors with the plurality of contacts and disposed in thedividing element.

The plurality of conductors may comprise a conductor selected from thegroup consisting of thin film conductors, thick film conductors, wireconductors and printed circuit conductors. The connector may alsocomprise a cassette, wherein the male connector is received in thecassette and the cassette is received in the female connector. Alsoincluded is a cassette fastener which is adapted to releasably couplethe cassette, the male connector and the female connector together. Thecassette fastener may threadably couple the cassette, the male connectorand the female connector together. The connector may also comprise abump stop which is adapted to help align the male connector with thefemale connector and also to prevent the male connector from moving inat least one direction relative to the female connector. The connectoralso may include a protective sheath adapted to cover the male andfemale connectors.

These and other embodiments are described in further details in thefollowing description related to the appended drawing figures.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 shows an embodiment of a multi-channel connector.

FIG. 2 illustrates a cross-section of the embodiment shown in FIG. 1.

FIG. 3 illustrates another embodiment of a multi-channel connector.

FIG. 4 illustrates a cross-section of the embodiment shown in FIG. 3.

FIG. 5 illustrates still another embodiment of a multi-channelconnector.

FIG. 6 illustrates the use of an alignment pin for proper indexing ofconnector components.

FIG. 6A shows a perspective view of an exemplary embodiment of aconnector.

FIG. 6B shows a front end view of the connector in FIG. 6A.

FIG. 6C shows a back end view of the connector in FIG. 6A.

FIG. 6D shows a longitudinal cross section of the connector in FIG. 6A.

FIG. 7 illustrates a cross-section of the multi-contact terminal portionof the embodiment shown in FIG. 1.

FIG. 8 illustrates a cross-section of an assembled multi-channelconnector.

FIG. 9 illustrates a protective sheath used for handling themulti-contact terminal.

FIG. 10 illustrates another embodiment of a multi-channel connector.

FIGS. 11A-11B illustrate the connecting tabs in the embodiment of FIG.10.

FIG. 12 illustrates another embodiment of the connecting tabs in theembodiment of FIG. 10.

FIGS. 13A-13B illustrate the shape of helical cardioid spring contacts.

FIGS. 14 and 15 illustrate how connecting tabs engage cardioid springcontacts.

FIGS. 16A-16B illustrate the multi-channel connector of FIG. 10assembled.

FIG. 17 shows a brain stimulating and recording lead implanted in apatient.

FIGS. 18A-18B illustrate the use of plug to form electrical contactsbetween the male and female connectors.

DETAILED DESCRIPTION OF THE INVENTION

FIG. 1 illustrates a preferred embodiment of the present invention. Amultiple contact connecting terminal, also referred to as a maleconnector 100 is integrated with a brain stimulating and recordingprobe. It is comprised of two hemi-cylindrical contact strips, each witha linear array of electrical contacts 140. The hemi-cylindrical strips100 insert into a cylindrical multiple contact connecting terminal alsoreferred to as a female connector 200 integrated with a lead extension.Screws 240 provide pressure to ensure secure electrical connections.

FIG. 2 illustrates a cross-section at position 310 of the embodimentillustrated in FIG. 1. This part could be manufactured by extrusion, orit could be machined. The probe terminal strips 100 slide into cavitiesor channels 230, and are indexed by the flat surface 235. In alternativeembodiments the space 235 could be a hemi-cylinder, and a small wire,rod or flat insert could index the terminal strips 100 to ensure thateach strip can be inserted into one cavity. Such inserts need not coursethe entire length of the connecting terminal 200, but could course onlya limited axial distance in the vicinity of cross section 330. It couldalso have a taper at its distal end, to facilitate insertion and properseating of the terminal strips 100, in the manner of a chamfer. Thedividing wall 260 separates and electrically insulates compressiblecontacts 270 (FIG. 8). It may be an integrated feature of the leadextension terminal 100, or it may be a separate part. Lead extensionwires course through the cavities 225 at more proximal stations.

FIG. 3 illustrates an alternative embodiment of the lead extensionterminal, in which a positioning cassette 220 inserts into thecylindrical terminal body 215. This embodiment facilitates fabricationby machining. A spacer 217 positions the cassette 210 properly withinthe cylinder. Holes 245 permit screws 240 to travel through the spacer217 to press upon the internal parts and effect a secure electricalconnection. The body 215 is a cylinder. During manufacturing, the spacer217 and cassette 220 may be inserted into the body 215 before drillingand tapping the holes 245, at which time the spacer 217 may bepermanently attached to the body 215 by an adhesive. The cylindricalterminal body 215 may be made of an engineered plastic, or for extrastrength may be made of a metal such as stainless steel, MP35N or othercobalt-chrome alloy, or tungsten. In one particular embodiment, thecylindrical terminal body is a 6 or 7 gauge thin-walled stainless steelhypodermic tube.

FIG. 4 provides an enlarged cross-sectional view of each of the majorcomponents of the embodiment in FIG. 3. The probe terminal strips 100slide into the cavities 230, indexed by a flat surface 235. As in theembodiment of FIG. 2, in variations of this embodiment space 235 couldbe a hemi-cylinder, and a small wire, rod or flat insert could index theterminal strips 100 to ensure that each strip can be inserted into onecavity. Such inserts need not course the entire length of the connectingterminal 220, but could course only a limited axial distance in thevicinity of cross section 330. It could also have a taper at its distalend, to facilitate insertion and proper seating of the terminal strips100, in the manner of a chamfer. Wires integrated with the leadextension course through the spaces 225 and 226. In this embodiment thespaces 226 in the spacer 217 may be machined by a larger tool than thespaces 225, to facilitate insertion of the assembled cassette into theconnector body 215 with the lid of the cassette 217 pre-attached. Holes245 are adapted to receive screws 240.

FIG. 5 illustrates an alternative cassette based embodiment, where thespaces 225 for the lead extension wires lay entirely within the cassette220. FIGS. 4-5 illustrate how different embodiments of the invention canpresent different manufacturing challenges. For example, if theembodiment of FIG. 4 is machined, the lower surface can be fabricated bya single flat cut, followed by machining two channels 226. Theembodiment of FIG. 5, on the other hand, requires three precise flatcuts.

FIG. 6 illustrates the position of an alignment pin in the embodimentsof FIGS. 1 and 3, at section 330. The terminal strips 100 are firstpositioned into nearly correct alignment by pushing against the end ofthe lead extension terminal body 210 or 215. Then a single pin 280 isinserted through the lead extension terminal body and the two terminalstrips. The pin 280 may be angled or chamfered to facilitate insertion,and the receiving surfaces 287, 288, 289 are also chamfered or beveledto facilitate final alignment by the pin. In alternative embodiments thereceiving surfaces need not be beveled. The stop flare 283 may fit flushagainst the receiving surface 287, and may be shaped by forging.

FIGS. 6A-6D illustrate an embodiment which incorporates a bump-stop 293,a mechanical feature which facilitates course alignment of the contactstrips with contact pads, to facilitate insertion of the pin 280. Thepin 280 ensures fine alignment. FIG. 6A shows a perspective view of theconnector, with the back end, showing the bump-stop 293 in theforeground. FIG. 6B shows an end view of the front of the connector,with receiving cavities or channels 230 terminated with the bump-stop293. FIG. 6C shows an end view of the back of the connector, with thebump-stop 293 obscuring the view of the receiving cavities or channels230. FIG. 6D shows a cross-section view showing the receiving cavity orchannel 230 terminated by the bump-stop 293.

FIG. 7 illustrates a cross-section of the probe terminal 100 in theembodiment of FIGS. 1 and 3, including the conductors 120, 125, and theterminal strip 130. The terminal strip provides a firm surface tosupport the electrical contact 140 as the compressible contact 270 (FIG.8) is forced against it by the screw 240 and pressure plate 250. At eachelectrical contact, one conductor from the probe penetrates the terminalstrip 130 to make a connection with the electrical contact. For example,stimulating conductor 120 contacts with electrical contact 140 atposition 122. The connection can be made by welding, or by thin filmmetallization. The profile of the terminal shell 110 can be thicker inlater cross-sections, as wires terminate. In alternative embodiments,the key surface 135 may only be at the end of the probe terminal, beyondthe alignment pin. In alternative embodiments, a divot in the terminalstrip 130 accommodates a guidewire when two terminal strips appose eachother. In other embodiments, the flat surface 135 may extend for thelength of the terminal 100, and a guidewire may course alongside theapposed strips, and be channeled to the center of the stimulating andrecording probe past the point where electrical connections are made. Insome alternative embodiments, the pressure plate 250 can be forcedagainst the compressible contacts 270 by a plug as illustrated in FIGS.18A-18B. FIG. 18A shows a perspective view of plug 1802 which isslidably received axially in the direction of arrow 1812 into female 25connector 1804 having channels 1806 which receive the male connector.Plug 1802 also has channels 1810 which provide space for conductorwires. FIG. 18B shows a side view of FIG. 18A. In still otherembodiments, a rotating camshaft may be used instead of the plug.

In alternative embodiments, the connecting terminal integrated with thebrain stimulating and recording probe could be constructed with printedcircuit or flexible circuit technology. For example, two planarmultilayer printed circuits could be apposed to each other, and groundor machined into a cylinder of the appropriate diameter so that thecontact an fit inside of a stylet when integrated with a medical lead.In alternative embodiments, the shape need not be a hemi-cylinder, andmay be flat, rectangular, triangular, elliptical, circular, square orovoid in cross-section, although such embodiments may be incompatiblewith existing surgical instruments such as a probe insertion guide tube.

FIG. 8 illustrates a cross-section through the assembled connector. Eachscrew secures two electrical connections. Engineered plastics such asPEEK, Ultem and/or Kapton ensure high strength and close tolerancesbetween the parts. The compressible contacts 270 accommodate variationsin the precise distances between parts, as well as insuring thatmicroscopic displacement can occur between conductors in contact witheach other. When the screw 240 impinges upon the pressure plate,compressible contacts 270 are forced against the electrical contacts140. As the contacts compress, at the micro level, the conductivesurfaces are displaced against each other and plastically deformed,ensuring a secure electrical connection. In different embodiments of theinvention, the compressible contacts could be a modified twist pin, afuzz button, a short rod, tube, or block of conductive elastomer, orother compressible conductor known to those skilled in the art. Theorientation of the flat electrical contacts 140 is approximately 45°relative to the direction of the force generated by the screw 240, toensure stable positioning of the compressible contacts 270. A barrierwall 260 insulates the compressible contacts from each other, and is ofa height which provides electrical insulation, while not interferingwith the downward displacement of the pressure plate 250. At each screwposition, each of two lead extension wires is integrated into acompressible contact.

In alternative embodiments, the dividing wall could be a thin multilayercircuit board, circuit card or flexible circuit, with conducting padsalong the upper most portion, and conductors along the lower portion andwithin the inner layers. In such embodiments, the upper cavities forlead extension wires 225 would not be needed, and the lower cavities forlead extension wires could assume the form of a slot positioning thedividing wall 260.

FIG. 9 illustrates a protective cover 180 for easy handling of themultiple contact connecting terminal integrated with the brainstimulating and recording probe 100. It is a cylinder, with a centralcavity sized to receive the two branches of the connecting terminalapposed to each other. In the embodiment illustrated, a single set screwcaptures the terminal inside the cylinder. In an alternative embodiment,a pin similar to that illustrated in FIG. 6, but with a head thatfacilitates quick and easy removal. Such a pin could take the form of aloop of fine wire, such as a fine wire suture, which could be twisted totemporarily capture the terminal within the cover. In an alternativeembodiment, the protective cover may be a thin elastomeric sheet.

FIG. 10 illustrates an alternative embodiment of the invention, in whichconnecting contacts are made by a twist action. A multiple contactingconnecting terminal 500 at the end of the brain stimulating andrecording probe inserts into a multiple contact connecting terminal atthe end of the lead extension. Up to 8 electrical contacts appear onprojecting surfaces of each multi-contact tab 520. An electricalconnection is made when the probe terminal 500 is twisted, wipingelectrical contacts on the tabs 520 against helical spring contactswithin the body of the lead extension terminal 400. Connecting terminal500 has two contact tabs 520 while connecting terminal 501 has threecontact tabs 520.

FIGS. 11A-11B illustrate an embodiment of the connecting tabs 520 of theconnector embodiment of FIG. 10. FIG. 11A highlights tabs 521 and FIG.11B is a side view of the connector. Four tabs 521 extend from theshaft. Two electrical contacts 540 appear on each tab, one facingtowards the opening of the lead extension terminal 400, and one facingaway from the opening. In the axial view, the electrical contact 540 isomitted from one tab for clarity. Likewise for clarity, the back tab isomitted from the parasagittal view. Stimulating 523 and recording 525wires course through a central cavity 580 and exit to achieve continuitywith the electrical contacts 540. The vias 582, 586 are angled in thesame direction, to facilitate fabrication of the probe terminal as amonolithic part, with the conductors threaded into the terminal. Otherembodiments may include a cavity 590 to accommodate a guidewire, as seenin FIG. 12.

Those skilled in the art will recognize that such a shape can beconstructed through machining, which will generate an extra hole 584, asa byproduct of the fabrication process. One way to machine such a partis to use a lathe to bore the central cavity 580 in a rod. Next, groovesare machined into the rod at the points where the multi-tab terminals520 will be placed, with the deepest part of the grove at the outerextent of the tabs, and the sides of the groove orthogonal to the axisof the vias 582. Additional grooves are machined with sides orthogonalto the vias 586. A drill is used to form the holes which become the vias582 and the accessory holes 584, as well as the holes which become theother vias 586. On the lathe, the material between the tab faces andbeyond the extent of the tabs is removed.

FIG. 12 illustrates an alternative embodiment of the multiple tabterminals 521, in which the probe conductors course outside of theterminal body. This embodiment has the advantage of simpler fabricationcompared to the embodiment in FIGS. 11A-11B. It has the disadvantage ofbeing weaker compared to the embodiment of FIG. 11, because the materialforming the shaft of the terminal is placed closer to the center of theshaft. A central cavity 590 can accommodate a guidewire or fluid. Again,the electrical contact 540 has been omitted from one of the tabs 521 sothat the tab may be clearly labeled.

FIG. 13A illustrates the basic shape of the helical cardioid springcontacts 440 of the extension lead terminal. Electrical contact is madewhen the probe terminal shaft is rotated, so that the flat electricalcontacts 540 are wiped against these spring contacts. These contacts maybe constructed of a conventional material. An example of a conventionalmaterial is an alloy of beryllium and copper, with the possible additionof nickel and cobalt. They may also be made of a biocompatible material,and may be gold plated.

FIGS. 14 and 15 illustrate some of the special advantages of such ashape. Four such springs are oriented along equally spaced angulardirections, and press against each face of each multiple contact tab520. The ends of the spring are closer to the center of the connector.One end is fixed in a support tab 420, and the other scrapes against thecontact 540. FIG. 13B illustrates the configuration in which thecontacts are engaged. FIG. 14 illustrates the configuration in which thecontacts are not engaged, and the individual tabs probe contact tabs 521can slide through the spaces between the springs as the probe terminalis inserted into the lead extension terminal. FIGS. 16A-16B show an endview and side view of the components of the multi-channel connector FIG.10 assembled.

FIG. 17 shows a monitoring and modulating probe or lead 812 secured tothe skull 811 of a patient with a fixture 816 and implanted into braintissue 814. An extension lead 818 couples the probe 812 with acontrollable pulse generator 819 via connector 815. Connector 815comprises a male and female connector coupled together. The lead oftenruns under the patient's skin, although it may not and the controllablepulse generator 819 may be implanted or it may remain external to thebody of the patient. Additional details on a fixture for securing theprobe to the skull are disclosed in U.S. Provisional Patent ApplicationNo. 60/908,367 filed Mar. 27, 2007, the entire contents of which areincorporated herein by reference.

While the exemplary embodiments have been described in some detail forclarity of understanding and by way of example, a variety of additionalmodifications, adaptations and changes may be clear to those of skill inthe art. Hence, the scope of the present invention is limited solely bythe appended claims.

1. A method for connecting a neurological device with a lead extension,the method comprising: positioning a male connector relative to a femaleconnector having one or more channels disposed therein; inserting themale connector into one of the channels thereby forming at least twoelectrical connections along two or more axial positions; releasablyfastening the male connector to the female connector; and implanting thecoupled male and female connectors in a patient, wherein theneurological device comprises a brain stimulating or recording lead;wherein one of the male or female connector is coupled with the leadextension, and the remaining connector is coupled with the neurologicaldevice.
 2. A method as in claim 1, wherein the female connector iselectrically coupled with a lead extension.
 3. A method as in claim 1,wherein the step of fastening comprising tightening a screw.
 4. A methodas in claim 1, wherein the step of fastening comprises rotating the maleconnector relative to the female connector thereby forming a secureelectrical connection therebetween.
 5. A method as in claim 1, whereinthe male and female connectors are compatible with magnetic resonanceimaging.